IEX Cloud (Discontinued) vs Twelve Data
Head-to-head market data API comparison. Updated 2026-05-24.
Overall winner: Twelve Data — wins 4 of 7 comparison axes.
Side-by-Side Comparison
| Feature | IEX Cloud (Discontinued) | Twelve Data |
|---|---|---|
| API Quality | 3/5 | 4/5 ✓ |
| Doc Quality | 3/5 | 4/5 ✓ |
| Data Latency | second | second |
| SDK Languages | 5 languages | 5 languages |
| Free Tier | No | Yes ✓ |
| Affiliate Program | No | Yes |
| Asset Coverage Breadth | 5 asset classes | 6 asset classes ✓ |
| Asset Coverage | US Equities, US Options, Crypto, Forex, Commodities | US Equities, Global Equities, Forex, Crypto, ETFs, Indices |
| Historical Depth | Service discontinued | 30+ years (daily); intraday varies by plan |
| Starting Price | N/A | $0/mo |
| Rate Limits | Service discontinued | Credit-based; each endpoint consumes different credit amount |
IEX Cloud (Discontinued): Best For
- Historical reference only
Not Ideal For
- Any new project — service is shut down
Twelve Data: Best For
- Global coverage needs
- Technical indicator API
- Fintech apps
- Forex + crypto combo
Not Ideal For
- Tick data / HFT
- Deep US options data
- Large bulk downloads
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